diff --git a/.dotfiles/docs/git.md b/.dotfiles/docs/git.md
new file mode 100644
index 0000000..742f13d
--- /dev/null
+++ b/.dotfiles/docs/git.md
@@ -0,0 +1,11 @@
+# Git
+
+## Setup GPG signing key
+
+```
+$ gpg --list-secret-keys --keyid-format LONG
+...
+$ git config --global user.signingkey <keyid>
+
+$ export GPG_TTY=$(tty)
+```